SU1303761A1 - Safety clutch - Google Patents

Abstract

The invention relates to the field of mechanical engineering, namely, devices for transmitting torques of limited magnitude. The aim of the invention is to increase the accuracy of the coupling operation. During the operation of the clutch, the pressure disc 6 under the action of the moment of resistance from the side of the driven half coupling (p) 8 turn I U / U ///// G in the corresponding direction relative to the leading P 1 -. As a consequence, the pressure sleeve 4 under the action of the balls 10 moves to the left, additionally compressing the spring 11. The balls 9 come into contact with the chamfered holes of the pressure disk 6 and P 1. When the maximum load is exceeded, the pressure disk slips relative to the friction disk 3. The sleeve 4 under the action of the spring 11 returns to the original position. This leads to a decrease in the spring force and an increase in the accuracy of the coupling operation. 2 hp f-ly, 3 ill. and W / 77 /////// 4V4VV VV4VV V S Fiar

Description

The invention relates to mechanical engineering, in particular to devices for transmitting torques of limited magnitude.

Fig. 1 shows a friction clutch, a longitudinal section; figure 2 - section aa in figure 1; on fig.Z - section bb in figure 1.

The safety friction clutch contains a leading coupling half 1, on which by means of a guide. the tabs 2 have a support sleeve 3, which is axially movable. The pressure sleeve 4 is mounted on the coupling half 1 freely. On the hub 4, by means of the guide pin 5, the pressure disk 6 is movably axially aligned with the hub. A friction disk 7 is placed between the pressure disk 6 and the flange of the coupling half 1, which functions as a stop disk, and is connected with the driven half coupling 8.

The squeezing device is complete in the form of balls 9, placed in a variable depth hole, filled in the flange of the coupling half 1 and the pressure disk 6 (figure 2).

The pressure device is made in

the form of balls 10, placed in similar holes (fig.Z), made in the support 3 and push 4 bushings. Between the pressure sleeve 4 and the pressure disk 6, there is a spring 11 of the heel, creating a force of closing. On the right, the spring force is sensed by the nuts 12, which are screwed onto the threaded end of the half-coupling I.

The size of the gap between the balls 9 and the bevels of the holes exceeds the same value of the gap between the balls 10 and the bevels of the corresponding holes.

The safety friction clutch operates as follows.

During operation, the torque is transmitted from the leading field 1 by means of key 2, stop sleeve 3, balls 10, pressure sleeve 4, key 5, pressure plate 6 on. the friction disk 7 and further to the driven half coupling 8. Under the action of the resistance forces from the pressure disk 6, the pressure sleeve 4 is displaced in the circumferential direction relative to the contact sleeve 3 in the direction opposite to the rotation of the coupling. The gaps between the balls 10 and the bevels of the sleeves 3

and 4 are selected and the latter come in contact with the balls. The balls 9 do not come into contact with the bevels of the thrust and pressure disks, since the circumferential gap between them translates into a similar gap between the balls.

10 and the corresponding bevels.

As a result of the interaction of the balls 10 with the bevels of the holes, a spreading force arises, which moves the pressure sleeve 4 in the direction of the pressure disk. There is an additional compression of the spring 11, equal to

-E

where F is the value of the spacer force acting on the sleeve 4; C - spring stiffness

As a result of increasing the spring force, the torque transmitted by the clutch reaches a nominal value, and at this time the balls 9 come into contact with the bevels of the thrust and pressure disk holes, resulting in dissolution of force, which tends to squeeze the pressure disk from the friction disk and is directed towards the force springs and spacer force balls GO.

As the moment of resistance on the side of the driven half coupling 8 increases, the spreading force on the side of the balls 9 decreases, which reduces the friction force on the friction disk 7. As a result of the interaction of the balls 9 and IO with the bevels of the holes under the action of the spring, the pressure sleeve 4 and the pressure disk 6 return to the original ( initial position, while due to the withdrawal of the sleeve 4 to the right, the force of the spring 1I decreases, which increases the accuracy of the coupling operation. Initial spring force

11 is chosen so as to provide the frictional moment necessary for the circumferential movement of the sleeve 4 on the friction disk 7.

Reducing the force of the spring when the coupling is activated increases the sensitivity of the coupling, reduces the dynamic overload acting on the coupling when operated and reduces the wear of friction pairs. one)

Adjusting the clutch to the required limit torque is carried out by nuts 2,

The use of the invention allows to increase the accuracy of the coupling operation, to reduce the dynamic loads at the moment of operation and to reduce the wear of the friction pairs.

Claims (2)

Invention Formula I. Friction clutch, containing the drive and driven coupling halves, connected by friction discs, mounted on the drive coupling half movably in axial and circumferential directions that, in order to ensure accuracy of operation, it is equipped with a pressure device located on the leading half-coupling and made in the form of balls placed in holes of variable depth, located in supporting and / f- / f 2 0 five 0 the pressure bushings, the bearing bush is mounted on the coupling half with the possibility of axial movement, the pressure is mounted on the half coupling coupling, the pressure disk is mounted on the pressure sleeve, and the spring is placed between the pressure disk and the pressure sleeve. 2. A clutch according to claim 1, characterized in that the size between the balls and the bevels of the wells of the squeezing device exceeds the same gap size for the pressing device. 37 Couplings according to Claims 1 and 2, characterized in that the vertices of the opposing holes of the pressing and squeezing devices are displaced relative to each other in the circumferential direction, while the apexes of the holes of the driving coupling half and the supporting sleeve, as well as the pressing disk and pressing sleeve are displaced relative to each other in the circumferential direction. ff-ff rigz Compiled by V.Ivanov Editor L.Povkhan Tekhred N.Glushchenko Proofreader M.Sharoshi  ..-... "and, ... ™ .., Order 2310 Circulation 811 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Proektna St., A.